What is a Geothermal HVAC system?

A Geothermal HVAC system uses the ability of the earth(geo) to act as a heat sink and source based on the ambient temperature of the atmosphere. Geothermal HVAC systems source heat from the earth during the winter and rejects heat during the summers.

Why Geothermal?

Savings, Environment, Comfort. A geothermal system is 40% more efficient than the traditional air-conditioning systems any day.Also, geothermal cooling systems do not require additional space for installation, thus reducing the need for space/land. In economic terms, the life of a geothermal HVAC system is over 25 years. The geothermal cooling system also results in significant reduction in GHG emissions; a typical 1 TR geothermal cooling system can mitigate 1.5 t CO2 eq. per year. The installation of the system can avoid almost 350 kg of H2SO4 based hazardous waste chemical per 1 TR per year.Installing a geothermal heat pump in a home has the same environmental impact as planting 750 trees.Installing a geothermal heat pump in a home has the same environmental impact as taking 2 cars off of the road!

How old is this technology?

This technology has been in existence for years altogether. It was installed for the first time in 1920’s. Overtime it has incorporated technological advancements and form the bedrock of central HVAC systems all across North America and Europe.

What is the difference between Geothermal and conventional system?

A geothermal system is typically made up of three components: one is the ground heat exchanger, a heat pump unit, and an air delivery system. The heat exchanger is basically a system of pipes and tubes called a loop, which is buried in the shallow ground near the building. A circulating heat absorbing fluid (e.g. water) circulates through these pipes to absorb or expel the available heat (Wong et al., 2012).The building heat is channelized through a geo field (water looping system in the earth), where the loop gives away heat to the Earth. There are two types of looping systems: (1) open loop in which water is drawn from a water body/aquifer and used in the system and later discharged into another water body/aquifer and; (2) closed loop, as name suggests, it uses working fluid which is continuously circulated in the closed loop. A geo field utilizing the close loop piping system ensures that there is no loss of water. This makes the use of water- cooled chiller systems viable even in areas where there is a dearth of water. While on the other hand, in a conventional set-up, the building heat is ejected into atmosphere through either air- cooled condenser coil or via a cooling tower. The system’s crux lies in rejecting the heat into the earth through piping loops. A geothermal system will give you the quickest return on investment of any form of renewable energy. Often, the price difference between a conventional heating system and a geothermal system can be paid back in 5-7 years . Using the earth’s relatively constant temperature a geothermal system can provide heating, cooling, and hot water for homes and commercial buildings.

What is the life and efficency of the system?

In economic terms, the life of a geothermal system is over 25 years,whereas the life of earth loops is 50-55 years .

Are Geothermal systems safe?

Geothermal systems are the safest heating and cooling system. It does not require gasses or fossil fuels, hence it does not produce any harmful gases. There is no risk of explosion.